Grinding and stropping machine.



R. s. GREEN. GR'NDING AND STROPPING MACHINE. APPLICATION FILED APR. I2. {915.

1,20OA21. Patented Oct. 3,1916.

Whess XML UNITED STATES PATENT oEEicE.

- '.R.APHAEL S. GREEN, OF CHICAGO, ILLINOIS.

GRINDING AN] STROPPING- MACHINE. v

Specification of Letters Patent.

Patented Oct. 3, 1916.

Application filed April 12, 1915. Serial No. 20,764.

stropping machines for sharpening razorblades and similar'cutting instruments, my

object beingto so construct such a device that the operation may be rendered continuous while the' grinding members may be driven in opposite directions from those of the honing members.

To these ends my invention consists in the combination of elements hereinafter more particularly described and definitely pointed out in the claims.

In the drawings, Figure 1, is a plan view of a machine embodying the features bf my invention, Fig. 2, is a section taken upon the line 2 2, Fig. 1, viewed in the direction of the arrows there shown, 3, is a like view taken upon the line 3-3, Fig. 1, and Fig. 4, is a central longitudinal, vertical sectional view through the sharpening rollers.

Referring to the drawings, 1, indicates the main frame of the machine in which is mounted in suitable bearings, a transverse horizontal shaft 2, adapted to be driven by means of a pulley 3. A like shaft 4, is mounted in bearings in the forward ends of frame arms.5, 5, which are jointedly connected at 6, 6, to the rear ends ofthe frame members 1. The shaft 4 is provided with a driving pulley 7. The shafts 2, and 4, are arranged parallel to each other and are adapted to be driven in opposite directions with respect to each other.

Arranged parallel to the shafts 2 and .4 in a plane midway-between them, is 'a feedscrew 8, which is journaled in hearings in the frame and is provided with a driving pulley 9. Mounted in like bearings in the frame is an eccentric shaft 10, which is parallel to and in the same horizontal plane with the feed-screw 8, and is provided with a driving pulley 11. A detachable workholder, enerally designated by 12, has a hinged arm 13, ointedly connected at 14 to the main body and adapted to be clamped at the opposite end by means of a manually controlled clamp 15. The feed-shaft is passed through a screw-threaded bore formed between the main body and the arm 13, while an elongated opening 16, Fig. 2, is formed between said parts for the reception of the eccentric shaft 10. Said workholder is provided with work-holding jaws 17, and a clamping device 18, for holding the blades 19 to be sharpened.

The mechanism so far set forth has been" described in a pending application for Letters-Patent heretofore filed by me.

Corresponding portions of the shafts 2 and 4 are preferably enlarged as shown at 20 and 21 respectively, Fig. 4, and have rigidly'mounted thereon, rollers 22 and 23, theperiphery of each of which is covered with leather 24, or other suitable stropping material.

Loosely mounted upon the reduced portions of said shafts are metal hubs 25, 26, said hubs having pulleys 27 and 28, respectively, Figs. 1 and 4, upon their outer ends. Secured by means of keys 29, 30 Figs. 3 and 4, upon the hubs 25 and 26, are one or more,

but preferably a plurality ofrings 31, 32, 33 of stone, emery or other suitable abrading material, which are separated by means of leather or other washers 34. Washers 35, are also inserted between the abrading rings 33 and the stropping material 24.

The operation of the device is-as follows: The pulleys 27 and 28 are independently driven at like speeds and in opposite directions as indicated by the arrows shown in Figs. 1 and 3, so as to move the grinding surfaces toward the edge of the blade 19, to be ground, which blade is vibrated between the two rollers by the movement of the work-holder 12, actuated in turn, by the rotation of the eccentric shaft 10, and'pivoted upon the feed-screw "8. At the same time the shafts2 and 4, which are driven in opposite directions with respect to each other, are also reversed with respect to the trio shaft and feed-screw, and is fed towardv the left, so that the work will first be v tween said work I shafts,

brought into contact with the grinding ring or rings and thence passed to the stropping surface. When the work-holder is fed to the left hand end of the honing rollers, it

is reinoved,the lengths of said rollers being such as to completely finish the sharpening process. I

It will. be apparent that a number of work-holders may be employed at once, one being attached upon the right as another is removed from theleft.

terial which element is made loose upon the shaft, provided the direction of move- 'ment, is reversed and they are so driven that the grinding surface maybe caused to move toward, and the stropping surface away from, the edge of the article to ened.

Having thus described my invention, 1. claim:

LA grinding and stropping machine, comprising in combination, parallel shafts, eaclrhaving mounted thereon grinding and stropping rollers one of'which is loose and the other rigid upon the shaft, means for rotating said shafts in opposite directions, means for rotating said loose members in opposite directions with respect to said means for supporting Work in a plane between said rollers, means for causing a lateral movement between said rollers and work with respect to each other to bring the work into successive contactwith said grinding and stropping surfaces and means for alternately causing contact beand the rollers upon said opposite shafts. v

2. A grinding and stropping machine,

be sharp means for rotating said shafts in opposite directions, means for rotating said loose members in opposite directions with respect to said shafts a work-holder mounted in a plane between said rollers, means for moving the same laterally to bring the work into successive contact with said, grinding and stropping surfaces and means for alternately causing contact between said work and the rollers upon opposite shafts.

3. A grinding and stropping machine, comprising, in combination, parallel shafts each having mounted thereon grinding and stropping rollers, one of whch rollers is loose and the other rigid upon the shaft, means for rotating said shafts in opposite directions, ineans for rotating said loose members in opposite directions with respect to said shafts, worlvholder mounted in a' plane between said. rollers, means for moving the same laterally to bring the work into successive contact with said grinding and stropping surfaces, and means for-vibrating said holder to alternately bring said work into'contact with the opposing rollers.

4. A machine of the class described, comprising, in combination, parallel shafts arranged to be rotated in opposite directions, cylindrical grinding and stropping members mounted upon each of said shafts, one being loose thereon and the other rigid therewith, means for rotating said loosely mounted members in opposite directions with respect to each other and to said shafts, means for alternately bringing work into operative contact with opposing members, and means for moving the same laterally to successively bring it into contact with said grind= ing and stropping surfaces.

In testimony whereof, i have signed this specification in the presence of two subscribmg Witnesses, this 9th day of April, 1915.

RAPHAEL S. GREEN.

WltlaS' JS:

DAVID H. FLETCHER,

JENNIE L. FIsKE. 

